Senior citizen abused by daughter

My grandmother (78 year old) is a retired pensioner from State Bank of India and she has disowned her daughter because of violent and abusive behaviour. Her daughter was living abroad since 2000 and came back to India in 2017. After she arrived she has been continuously fighting with my grandmother, mother, father and me. She keeps abusing and singing all day long irrespective of time. She also keeps recording my family like if we are going from one room to another she will record it and state that we are spying on her and threatens. In Feb, 2021, me and my father were not home, as usual she picked up fight with my mom and hit her on the head due to which my mom got 3-4 stitches. My grandmother and my mother has already filed numerous complaints against her in the local police station but no action has been taken. Every time police comes to our house they say that it's family matter and that they can't help. My grandmother doesn't want to live with her daughter nor want her to stay with her. Her daughter is not earning and she is single. Now she always ask for money from my grandmother and if she refuses to give any amount she threatens to file false complaints against me and my father.